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iDStretch App to reveal faint rock art

My friend had been using this for the past year or so and just clued me in on it’s existence.

Has anyone else ever used it? The price may scare away a lot of people though starting at $20.

Quoting the iPhone App:

“DStretch is a rock art enhancement program used by researchers worldwide.

iDStretch is a version for the iPad and iPhone that can be used in the field to reveal faint rock art.

iDStretch provides enhancements for a variety of pigments found in rock art. It is fast, simple to use, and enhancements can be saved. iDStretch needs no connectivity to work so enhancements can be done in remote places away from cell service or WiFi.

You can load an image from the album or take a picture with the camera.”

God·win's Law1. [noun]The theory that as an online discussion progresses, it becomes inevitable that someone or something will eventually be compared to Adolf Hitler or the Nazis, regardless of the original topic.

"correcting others' errors, especially online, can quickly lead to invocations of Godwin's law"

My friend had been using this for the past year or so and just clued me in on it’s existence.

Has anyone else ever used it?\

I have used this program in the the past, but , with much trepidation I will say that the experience of the sites first hand is what
I live for...I visit sites at different times of year to see what will be revealed....for me the journey of discovery has to be live and in person to try to even understand a small part of the wonder and mystery I am experiencing...